Plate air-heater construction



Sept. 3, 1929. W. LONSDALE l 1,727,124

PLATEAIR HEATER CONSTRUCTION Filed April 10, 192e "cBcBc Patented Sept. 3, 1929. y

UNITED STATES,

WILLIAM LONSDALE,

WHEELER CORPORATION, 0F NEW YORK,

0F ROSELLE PARK, NEW JERSEY, ASSIGNO-R T0 FOSTER Y., A `GOllREEOB'AIZIION OF NEW YORK.

PLATE AIB-HEATER CONSTRUCTION.

Application illed April 10, 1928. Serial No. 268,845.

The present invention relates to plate air heater units in each of which a multiplicity of suitably shaped plates are arranged to fo'rm cells, which are alternately open at their sides and ends. The heater unit is thus formed with two sets of channels providing paths of liow, perpendicular to eachother in parallel planes, one for the heating gases and the second for the vair or other gas to be heated. In forming the cell structure, each plate isv cut away vat the corners and corner pieces are provided for se arating the air and heating gas channe s. Air heater units of the above type are disclosed in U. S. Reissue Patent, 16,807 to Eugen Haber, reissued December 6,1927. The object of my present invention is lto provide improved means for sealing thev portion of the air and heating gas. channels at each corner of the heater unit.

rlhe various features of novelty which 4characterize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of the invention, however, and the advantages possessed by it reference should be had to the accompanying drawings and descriptive matter in which I have illustrated and described a preferred e bodiment ofthe invention. a

Of the drawings;

Fig. 1 is a perspective view of a heater unit with the corner piece removed from the front corner;

Fig. 2 is an enlarged plan viewl part-ly in section of the corner sealing means in position; and

Fig. 3 .is a sectional elevation on the line 3-3 of Fig. 2.

In the drawings and particularly in Fi 1 I have illustrated an air h eater unit having top yand bottom plates A' and Az respectively and intermediate plates A. Each of the 'plates Aa is cut away at its corners a'nd the V projecting end portions formed by that operation are bent to unitewith bent portions of adjacent plates .-forming a plurality of cells. The end portions of the plates aregso bentthat channels are formed in the cells and alternately open in directions at right angles to one another.- In the construction shownthe channels yB are used for the passage of the heating,

gases and the channels C are utilized for the passage Aof the air to be heated. As shown in Fig. 1, .pxortions of the channels are open to each ot er at each corner of the unit. It has been found extremely diilcult due to the high temperature conditions present to provide effective means for sealing the corners of the heater unit so that the individual channels may be separated from one another and a gas-tight construction maintained.

In the construction shown the individual plates A3 are connected by through bolts D, each of which extends beyond the top and bottom plates A and A2 ofy theheater unit 'and is provided with a nut E threaded on each end. The individual plates forming each cell are usually separated by undulated stripsof sheet metal F extending parallel to the closed sides `of each channel. These strips serve to space-the plates apart a uniform distance when `the nuts E are tightened and also serve to divide the indiv1dual channel into separate sections.

. The improved provisions of my present invention for sealing each corner of the heating unit comprise a stay. bolt G located adjacent each corner and within the heater unit. As illustrated in Fig. 3j the plates Aa are separated at the points surrounding the openings in the plates through which the stay bolts G pass by metal bushings H. At spaced points along each stay bolt G and preferably within a heating gas channel B eye bolts K areprovided in lieu of the bushin s H. Each eye holt is arranged with its en arged end K surrounding thecorresponding bolt Gr and with its outer threadthe edge portions of the 1ndvidual plates by a strip of asbestos packing. The strip is bent transversely to conform to the shape of the cut out corner portions. On the outer side of the metal strip is placed a second strip of packing N. Each strip isperforated at spaced points along its length for the passage therethrough of the eye bolts K.

f Means are provided for maintaining a uniform pressure on the metallic strip M throughout its length and comprise thick steel plate sections O suitably bent transversely and mounted on. the eye bolts, the

' sections.

f tially triangular in cross section' as shown in Fig. 2 and \contacts vwith the outer side of `the corresponding plate section O. The

. While in' accordance with the certain features of my Jused to advantage without-a various parts are pressed into position in` the corner by tightening the nuts Q threaded on the outer end of the stay bolts G and separated from the base of kthe correspondj in block P by a waslier Q'.-

ach heater unit is adapted to be assembled with similar units to obtain'the required amount of. heating surface Afor each installation. The edge portions `of each heater unit are therefore provided with flan es R tov which corresponding flanges on t e units to be assembled therewith are connected. The corner ilan esare yformed byweldin an angle beam to each projecting `en of the metallic .strip M at the points S and S. i

My invention is characterized by the simplicity and effectiveness of the sealing provisions and the ease in which theycan be incorporated into the heater unit. The arrangement ofthe plates and blocks rovides a uniform pressure on all parts'of t e ackiltlg and metallic strip and has been ound e vective in maintainlng a gas-tight ]o1nt under high temperature conditions. The' corner pieces can be'easily removed for renewing the packing-strips or other parts without removing the stay bolt or the eye bolts thereon. if

i rovisions of.the`statutes,.1.have illustrate and described the best form of embodiment of my invention now known' to me, it will bel apparent to those skilled in the art that changes may be made in the form of the a paratus disclosed without departing from t e spirit of my '/invention as set forth 1n the appended claims and that in some cases invention may be corresponding use of otherl features.

Having now describedsmy inventicn, what I claim as new and desire. to secure by Letters Patent, is:

' 1. A heating unit comprising in combination a plurality of superposed plates having a le rtlons cnt away at, the corners, the edges 1:; said plates bent so thata pluralityof channels a're rxned, alternata channels sides, and means inserted in a cut awaycorv ner of said pla'tes for separating said chanlne said means comprising astay boltexlate section 0 is forced lel to edges A ran sections, and means being, arranged to open at diferentmaras-1 .extending subs'racially parallel to said stay bolt and vmeans connected to ysaid stay bolt for holding said strip .in position i'n said comer.)- l v 2. A heating unit comprisingin combination a pluralityI of superposed plates havlng angleportions cutaway at the corners,

the edges of said plates beingbent so that a plurality' of channels are formed, alternate channels being arranged to open at different sides, andmeans inserted ina cut 'away corner of said plates for separating 'said channels, bolt extending through said plates, a bent Ymetallic strip extending substantially paralsaid stay bolt, plate sections in end to end relation on the outer side of said metallic strip, packing interposed between said strip and angle portions and between said strip and said plate sections, and means connected to saidJ stay bolt for. holding said strip, packing, oand plate sectlons in position in said corner.

3. A heating unit comprising in combina--v tion a pluralityof superposed plates having angle portionsl cut away at the corners, the of said plates being bent so that -a plu,- rality of channels are formed,l alternate channels being arranged to open at different sides, and means inserted in 'a cut away corner of said plates for.`separating said chansaid means comprising a stayl l \a plurality of heavy Y nels .said means comprising a stay bolt extendlng through said plates, a bent metallic strip extending substantially parallel to said stay bolt, a plurality in end to end relatlon on the outer side of 'said metallic strip, a plurality of eye bolts connected to said stay bolt and extendin through 4said stri and late sections,'an means on said bo ts for olding said strip of heavy plate sections 4. A heating unit comprising in combination a plurality ofsuperposed plates having angle portions cut away at the corners, the edges ofA said plates bein bent so that a plurality of channels are ormed, alternate channels being arranged to open. at different sides', corner of said plates for channels, said means com extending-through` said p `separating said rising a lstay bolt ates, a bent metallic strip e'xtendlng substantially parallel to i lsaid-stay bolt f tion a lurality of superposed plates having' -angle-portions cut away at the corners, thell and means inserted 1n a cut away v plate sections, and blocks y and platesections in position in said corner.v l

`ner of said plates for separating said chan- (i. 4A sealing means for 'apparatus having cut away corner portions comprising a -vertical-stay bolt mounted in. said apparatus, la

metallic strip extending parallel to said bolt, 20 a plurality of plate. sections in ,end to end relation on one side of said strip, a plurality ofeye bolts mounted on said sta .bolt and projecting'through said strip an plate sections, and means f on said eye ing said strip and plate sections in position in said corner.

Signed at New York edges of said. plates being bent so that a plurality of channels are formed, alternate. channels being arranged to open at diierent sides, and means inserted in a cut away cornels said means comprising a stay bolt extending through said plates, a bent metallic strip extending substantially (parallel to'said stay bolt, a pair of longitu inally extending iianges mounted on o posite vedges of said metallic strip, a plura ity of heavy platesections in end to end relation-on the outer @it side of said metallic strip, and means conlNew York and State of New York, thls nected to said stay bolt, -for vholding said day of April, A. D.v 1928.

strip, and plate sections `in position 1n said WILLIAM LONSDALE.

bolts for hold- 25 i. 

